Logic Pro 9 made its debut in the Mac App Store today for $199.99. The software also received a rather substantial update today with the release of the Logic 9.1.6 update. This update brings numerous fixes and improvements to the software. More details about it can be found over here on Apple's website. The Logic Pro 9.1.6 update weighs in at 195.35MB and requires Mac OS X 10.6.8 or later. It should also be noted that MainStage 2 saw its debut on the Mac App Store as well today.